The human flea is actually rare in Central Europe. However, in Berlin, the parasites are currently spreading—likely due to foxes. PETBOOK editor and biologist Saskia Schneider explains how fleas ...

There are more than 2,000 species of tiny (0.04 to 0.15 inches), wingless, blood-sucking fleas that live on the body of the host they infest. Although fleas cannot fly, they have developed powerful ...